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- W2090870556 abstract "We investigate the back reaction of cosmological perturbations on an inflationary universe using the renormalization-group method. The second-order zero mode solution which appears by the nonlinearity of the Einstein equation is regarded as a secular term of a perturbative expansion; we redefine the constants of integration contained in the background solution, and the secular terms are absorbed in these constants in a gauge-invariant manner. The resulting renormalization-group equation describes the back reaction effect of inhomogeneity on the background universe. For a scalar-type classical perturbation, by solving the renormalization-group equation, we find that the back reaction of the long wavelength fluctuation works as a positive spatial curvature, and the short wavelength fluctuation works as a radiation fluid. For the long wavelength quantum fluctuation, the effect of back reaction is equivalent to a negative spatial curvature." @default.
- W2090870556 created "2016-06-24" @default.
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- W2090870556 date "2001-01-23" @default.
- W2090870556 modified "2023-10-09" @default.
- W2090870556 title "Back reaction problem in the inflationary universe" @default.
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- W2090870556 doi "https://doi.org/10.1103/physrevd.63.044013" @default.
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